Dublin 4, also rendered as D4 and D04, is a historic postal district of Dublin, Ireland including Baggot Street Upper, the southernmost fringes of the Dublin Docklands, and the suburbs of Ballsbridge, Donnybrook, Irishtown, Merrion, Ringsend and Sandymount, on the Southside of Dublin. Most of the area was known as Pembroke until 1930 when it was abs…Dublin 4, also rendered as D4 and D04, is a historic postal district of Dublin, Ireland including Baggot Street Upper, the southernmost fringes of the Dublin Docklands, and the suburbs of Ballsbridge, Donnybrook, Irishtown, Merrion, Ringsend and Sandymount, on the Southside of Dublin. Most of the area was known as Pembroke until 1930 when it was absorbed by the City of Dublin.